在 matplotlib 中将 x 轴移动到绘图的顶部

Moving x-axis to the top of a plot in matplotlib

提问人:Jason Sundram 提问时间:1/19/2013 最后编辑:CommunityJason Sundram 更新时间:3/30/2020 访问量:176876

问:

基于这个关于 matplotlib 中热图的问题,我想将 x 轴标题移动到绘图的顶部。

import matplotlib.pyplot as plt
import numpy as np
column_labels = list('ABCD')
row_labels = list('WXYZ')
data = np.random.rand(4,4)
fig, ax = plt.subplots()
heatmap = ax.pcolor(data, cmap=plt.cm.Blues)

# put the major ticks at the middle of each cell
ax.set_xticks(np.arange(data.shape[0])+0.5, minor=False)
ax.set_yticks(np.arange(data.shape[1])+0.5, minor=False)

# want a more natural, table-like display
ax.invert_yaxis()
ax.xaxis.set_label_position('top') # <-- This doesn't work!

ax.set_xticklabels(row_labels, minor=False)
ax.set_yticklabels(column_labels, minor=False)
plt.show()

但是,调用 matplotlib 的set_label_position(如上所述)似乎没有达到预期的效果。这是我的输出:

enter image description here

我做错了什么?

python matplotlib 绘图 数据可视化

评论


答:

49赞 Lev Levitsky 1/19/2013 #1

你想要set_ticks_position而不是:set_label_position

ax.xaxis.set_ticks_position('top') # the rest is the same

这给了我:

enter image description here

233赞 unutbu 1/19/2013 #2

ax.xaxis.tick_top()

将刻度线放置在图像顶部。命令

ax.set_xlabel('X LABEL')    
ax.xaxis.set_label_position('top') 

影响标签,而不是刻度线。

import matplotlib.pyplot as plt
import numpy as np
column_labels = list('ABCD')
row_labels = list('WXYZ')
data = np.random.rand(4, 4)
fig, ax = plt.subplots()
heatmap = ax.pcolor(data, cmap=plt.cm.Blues)

# put the major ticks at the middle of each cell
ax.set_xticks(np.arange(data.shape[1]) + 0.5, minor=False)
ax.set_yticks(np.arange(data.shape[0]) + 0.5, minor=False)

# want a more natural, table-like display
ax.invert_yaxis()
ax.xaxis.tick_top()

ax.set_xticklabels(column_labels, minor=False)
ax.set_yticklabels(row_labels, minor=False)
plt.show()

enter image description here

1赞 user1420304 5/3/2013 #3

如果你想让蜱虫(不是标签)出现在顶部和底部(而不仅仅是顶部),你必须做一些额外的按摩。我能做到这一点的唯一方法是对 unutbu 的代码进行细微的更改:

import matplotlib.pyplot as plt
import numpy as np
column_labels = list('ABCD')
row_labels = list('WXYZ')
data = np.random.rand(4, 4)
fig, ax = plt.subplots()
heatmap = ax.pcolor(data, cmap=plt.cm.Blues)

# put the major ticks at the middle of each cell
ax.set_xticks(np.arange(data.shape[1]) + 0.5, minor=False)
ax.set_yticks(np.arange(data.shape[0]) + 0.5, minor=False)

# want a more natural, table-like display
ax.invert_yaxis()
ax.xaxis.tick_top()
ax.xaxis.set_ticks_position('both') # THIS IS THE ONLY CHANGE

ax.set_xticklabels(column_labels, minor=False)
ax.set_yticklabels(row_labels, minor=False)
plt.show()

输出:

enter image description here

25赞 wSmit 10/3/2013 #4

tick_params对于设置即时报价属性非常有用。标签可以通过以下方式移动到顶部:

    ax.tick_params(labelbottom=False,labeltop=True)

评论

0赞 Milo Wielondek 10/8/2019
Kwargs 是布尔值,所以应该是 和 分别,否则工作完美!FalseTrue
0赞 Josh 12/11/2023 #5

对于正在搜索顶级标签但以我开头并且不想切换到我的人,那么,从这两行开始绘图:pltax

    plt.rcParams['xtick.bottom'] = plt.rcParams['xtick.labelbottom'] = False
    plt.rcParams['xtick.top'] = plt.rcParams['xtick.labeltop'] = True